User Guide
Page 30
...camera zooms in blue. White range: optical zoom range where the image will change depending on the subject. Yellow range: digital zoom range where the image is then indicated on Subjects (Digital Zoom) When distant subjects are too far away to enlarge using optical zoom, use digital zoom for up to about 48x ( ELPH 170 IS IXUS 170... ) or 32x ( IXUS 165 ELPH 160 IXUS 160 ) enlargement. In this case, the zoom factor is shown in even closer on the zoom...
...camera zooms in blue. White range: optical zoom range where the image will change depending on the subject. Yellow range: digital zoom range where the image is then indicated on Subjects (Digital Zoom) When distant subjects are too far away to enlarge using optical zoom, use digital zoom for up to about 48x ( ELPH 170 IS IXUS 170... ) or 32x ( IXUS 165 ELPH 160 IXUS 160 ) enlargement. In this case, the zoom factor is shown in even closer on the zoom...